(stephenfin): Raise an exception here in tox 4.0

[todo]

tox/src/tox/config/__init__.py

Lines 574 to 579 in 407121b

	# TODO(stephenfin): Raise an exception here in tox 4.0
	warnings.warn(
	"conflicting basepython version (set {}, should be {}) for env '{}';"
	"resolve conflict or set ignore_basepython_conflict".format(
	proposed_version, implied_version, testenv_config.envname
	)

---

This issue was generated by todo based on a TODO comment in 407121b when #1229 was merged. cc @gaborbernat.

[todo]

This issue has been reopened because the TODO comment still exists in src/tox/config/init.py, as of ba23c86.

---

If this was not intentional, just remove the comment from your code. You can also set the reopenClosed config if you don't want this to happen at all anymore.

[todo]

This issue has been reopened because the TODO comment still exists in src/tox/config/init.py, as of d0e255c.

---

If this was not intentional, just remove the comment from your code. You can also set the reopenClosed config if you don't want this to happen at all anymore.

[gaborbernat]

This is done.